Return the current release of blender on command line
Using akira's idea, you could use wget --spider to search the web page for links without downloading them. Then you could use something like awk or python to filter the output for the desired urls:

% wget -r -np --spider https://builder.blender.org/download/ 2&gt;&amp;1 | python -c "import sys; print(''.join([line.rsplit(' ', 1)[-1] for line in sys.stdin if all(term in line for term in ['http','linux'])]))"
https://builder.blender.org/download/blender-2.80-430cf7e15eef-linux-glibc224-x86_64.tar.bz2
https://builder.blender.org/download/blender-2.80-96f762500ef9-linux-glibc224-i686.tar.bz2
https://builder.blender.org/download/blender-2.79-e6acb4fba094-linux-glibc224-x86_64.tar.bz2
https://builder.blender.org/download/blender-2.79-e6acb4fba094-linux-glibc224-i686.tar.bz2